robie



(No Model.)

.J. B. ROBIE.

DENTAL VULGANIZER. No. 560,327. Patented May 19, 1896.

7 1 b E. d r 1 M I "I oll,

. with my improvement.

UNITED STATES PATENT OFFICE.

.IOHN E. ROBIE, OF BUFFALO, NEIV YORK, ASSIGNOR TO THE BUFFALO DENTALMANUFACTURING COMPANY, OF SAME PLACE.

DENTAL VULCANIZER.

SPECIFICATION forming part of Letters Patent No. 560,327, dated May 19,1896. Application filed January 11, 1896. Serial No 575,063. (No model.)

To all whom it may concern:

Be it known that I, JOHN E. ROBIE, a citizen of the United States,residing at Buffalo,

in the county of Erie and State of New York,

have invented a new and usefulImprovement in Dental Vulcanizers, ofwhich the following is a specification.

This invention relates to dental vulcanizers in which a detachable yokeor cross-bar is employed for clamping the cover upon thevalcanizing-pot.

The object of my invention is to provide the Vulcanizer with a' reliableclamping yoke which can be readily applied and removed from the pot andwhich is free from loose or swinging parts that are liable to becomedetached or interfere with the easy manipulation of the yoke.

In the accompanying drawings, Figure l is a sectional elevation of avulcanizer provided Fig. 2 is a top plan view thereof. Fig. 3 is ahorizontal section in line 3 3, Fig. 1. Fig. 4 is an elevation of thevulcanizer at right angles to Fig. 1.

Like letters of reference refer to like parts in the several figures.

A is the vulcanizing-pot, provided at its upper end with anoutwardly-projecting rim or flange a, and B is the cover provided in theunder side of its marginal portion with a packing-ring b, which restsupon the rim of the pot, and with a depending rim 1), which fits intothe pot.

O is a projecting ring, collar, or flange secured around the upperportion of the pot and bearing against the under side of the rim a.

D represents the yoke or cross-bar, whereby the cover is clamped uponthe pot. This yoke engages at one end in an upright loop orvertically-slotted bar E, secured to the ring 0 on one side of the potand extending upward above the cover. The upper cross-bar of this loopis provided with a sharp or V-shaped lower edge e, which fits in acorresponding notch or depression cl, formed in the adjacent upper sideof the yoke, whereby the yoke is held against longitudinal displacementin the loop. The yoke is provided at its opposite end with a dependingarm (1, terminating in a hook or nose (1 which engages under the loweredge of the ring 0 of the pot. This depending arm is confined againstlateral displacement by a pair of upright lugs f, arranged on the ring 0on opposite sides of the arm, as clearly shown in Figs. 2 and 3. Theportion of the ring with which the hook 61 engages is preferablyundercut or inclined outwardly as shown in Fig. 1, to more reliablyinterlock the hook with the ring.

G is a clamping-bolt engaging in an internally-screW-threaded openingformed in a central boss or enlargement h of the yoke and bearing at itslower end upon the cover, whereby the depending hook d of the yoke isheld in engagement with the ring 0 of the pot and the opposite end ofthe yoke in engagement with the loop E. The cover is preferably providedwith a conical or concave seat i for the lower end of the clamping-bolt.

J is a handle extending horizontally from the front end of the yoke andarranged in line therewith.

7c is a pin or projection secured to the loop E and entering a notch orrecess Z formed in the edge of the cover when the latter is applied tothe pot, as shown in Fig. 1, whereby the cover is always placed in thesame position on the pot. In applying the yoke to the pot for clampingthe cover the rear end of I the yoke is passed through the loop E, andthe depending arm cl of the yoke is at the same time engaged between thelugs f on the front side of the pot, so as to bring the hook of said armunderneath the ring 0 of the pot, the clamping bolt being unscrewedsufficiently to permit of this operation. The clampingbolt is thentightened, whereby the yoke is raised, and its notched front end andhooked rear end are caused to interlock securely with the loop E and theunder side of the ring 0, respectively, thus tightly clamping the coveron the pot. In tightening the clamping-bolt the V-shaped edge e of theloop E tends to center the yoke or draw it into its proper position incase the notch 01 of the 5 yoke does not accurately register with saidedge after inserting the yoke in the loop. The conical seat 2' in thecenter of the cover aids this action. The yoke is readily removed forreleasing the coverby loosening the ICC clamping-bolt and withdrawingthe yoke from the loop E. The lugs f may be omitted, if desired; butthey are preferably employed.

I claim as my invention-- 1. The combination with a vuloanizing-potprovided on one side with an upright loop extending above the upper endthereof, and below said upper end with a flange or ring, of a coverseated on the pot, a removable yoke extending across the cover andengaging at one end in said loop and provided at its opposite end with adepending hook which engages under said ring or flange, and a verticalclamping-bolt carried by the yoke and bearing upon the cover,substantially as set forth.

2. The combination with a vulcanizing-pot provided on one side with anupright loop extending above the upper end thereof, and below said upperend with a flange or ring havin g a pair of projecting lugs, of a coverseated on the pot, a removable yoke extending across the cover andengaging at one end in said loop and provided at its opposite end wit-ha depending arm engaging between said lugs and terminating in a hookwhich interlocks with said ring or flange, and a clamping-bolt carriedby said yoke and bearing upon the cover, substantially as set forth.

3. The combination with a vuleanizingpot provided below its upper endwith a ring or flange and on one side thereof with an upright loophaving its upper bar provided with a V-shaped lower edge, of a cover anda yoke extending across the cover and provided at one end with adepending hook which inter looks with said ring or flange and at itsopposite end with a notch or recess which engages with the V-shapedcross-bar of said loop, and a clamping device carried by the yoke andbearing upon the cover, substantially as set forth.

\Vitness my hand this 8th day of January, 1896.

JOHN E. ROBIE. lVitnesse.

THEO. G. LEWIs, CARL F. GEYER.

